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ts only in recent years that it has been possible to create a polythene which allows the full spectrum of natural UV daylight through. This full UV spectrum film has a dramatic effect on flower, fruit and foliage colours, particularly on the blues and reds as UV is the spectral wavelength that is required to intensify these colours. Normal films and glass block the UV below 350 Nms. but SunMaster Diffused transmits the same full spectrum of natural UV light that plants get outside.